Malicious PDF — malware analysis report

Static analysis result for SHA-256 17fb24c828d3e6dd…

MALICIOUS

PDF

85.0 KB Created: 2021-09-05 00:46:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2461cf984e6d39db17b341012caa83dc SHA-1: bbf9c3c3252d5266e5134a1e8647d40ed21a4def SHA-256: 17fb24c828d3e6dd96006def582cbec2a127db65e71f933062600f0dadb8b040
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised websites, including WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The PDF structure itself is also noted as a link farm, further supporting its role in directing users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://alkalacarservice.com/public_html/userfiles/file/fiwazijalimuzoj.pdf In PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d1eb4ec7149---xezawumatobofivus.pdfIn PDF document text
    • http://reunionfamily.com/clients/6/6c/6c58f7de0247188f02debbcda007d80b/File/niliximoxuwulenexekutem.pdfIn PDF document text
    • http://tweddlefoto.com/files_contenidos/upload/files/11209389605.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/desebed.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/c7f1e7f84068fd56fe95a4ba33fb4752/lebiv.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/nq30d20lu2skdi2ksl8h9qe57r/gaginorusilereninagemetob.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/40ead06a748ce5fe96a41d1991c666db/xisudorokotarimelewife.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd28bc45d4---62409415886.pdfIn PDF document text
    • http://armanetti.com/images/86448248982.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9a7d36ac6---vebeva.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/89285245387.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/67302716299.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/julowisebima.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131bd349c0fa---wagodudixijotiwisipaxazit.pdfIn PDF document text
    • http://moristas.com/userfiles/files/kizabax.pdfIn PDF document text
    • http://k1a.ru/images/files/file/89941569382.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/585330a10c0056b50766d4449bf90aa9/xakilekilemojovu.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf38f92c7b---xinekimelidelixidorajesus.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b9b36f8bd---72516653660.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611331081d4bc---45604039710.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/98538169395.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=manual+de+identidad+corporativa+ejemplos+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DE 18544 bytes
SHA-256: 8aa70463735ef51923e4c0890b0417f7d8ffa8a3b6df2ffa8cfbb6eee54ff284
font_01_sfnt_off00011462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11462 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C79 11072 bytes
SHA-256: 2ee85f6ce5724f9270327c77eafe7b106cfc889ec5f392aeba4f7dd77240eec9

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